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Giving of notices and copies of orders. 
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18.—For the purposes of this Act, a notice or a copy of an order may be given to a person in any of the following ways, that is to say;— 
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(a) by delivering it to such person, 
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(b) by leaving it at the address where such person ordinarily resides or, in the case of an objector to a proposal, at his address as stated in his objection, or 
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(c) by sending it by post in a prepaid registered letter addressed to such person at the address where he ordinarily resides or, in the case of an objector to a proposal, at his address as stated in his objection. 
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